Business social network LinkedIn may have given us a few hints on the existence of 7; the next title in the long-running series, expected out towards the end of the 2010.

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A senior (Call of Duty: World at War) animator inadvertently gave the game away via his CV, noting: "I am currently on my second title as a senior animator in the games with / Treyarch on Call Of Duty 7."

We've yet to see a great deal on 2, so it's far too early for Activision to talk about number seven. Still, this news is hardly surprising given that Treyarch and tend to rotate annual releases.

Rumours have already been circulated suggesting that the seventh title in the series will be set during the Vietnam war. More as we get it.

By Luke Guttridge